linux-kernel - Re: [PATCH v5 1/2] dt-bindings: it6505: add properties to restrict output bandwidth

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Message-ID: <20221024163748.GA1874793-robh@kernel.org>
Date:   Mon, 24 Oct 2022 11:37:48 -0500
From:   Rob Herring <robh@...nel.org>
To:     allen <allen.chen@....com.tw>
Cc:     Pin-Yen Lin <treapking@...omium.org>,
        Jau-Chih Tseng <Jau-Chih.Tseng@....com.tw>,
        Hermes Wu <Hermes.Wu@....com.tw>,
        Kenneth Hung <Kenneth.Hung@....com.tw>,
        Andrzej Hajda <andrzej.hajda@...el.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Robert Foss <robert.foss@...aro.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        "open list:DRM DRIVERS" <dri-devel@...ts.freedesktop.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 1/2] dt-bindings: it6505: add properties to restrict
 output bandwidth

On Wed, Oct 19, 2022 at 05:32:13PM +0800, allen wrote:
> From: allen chen <allen.chen@....com.tw>
> 
> Add properties to restrict dp output data-lanes and clock.
> 
> Signed-off-by: Pin-Yen Lin <treapking@...omium.org>
> Signed-off-by: Allen Chen <allen.chen@....com.tw>
> ---
>  .../bindings/display/bridge/ite,it6505.yaml   | 89 +++++++++++++++++--
>  1 file changed, 83 insertions(+), 6 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml b/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml
> index 833d11b2303a7..8e607b6929fc9 100644
> --- a/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml
> +++ b/Documentation/devicetree/bindings/display/bridge/ite,it6505.yaml
> @@ -52,9 +52,70 @@ properties:
>      maxItems: 1
>      description: extcon specifier for the Power Delivery
>  
> -  port:
> -    $ref: /schemas/graph.yaml#/properties/port
> -    description: A port node pointing to DPI host port node

No existing users you are breaking? The commit msg should explain.

> +  ports:
> +    $ref: /schemas/graph.yaml#/properties/ports
> +
> +    properties:
> +      port@0:
> +        $ref: /schemas/graph.yaml#/$defs/port-base
> +        unevaluatedProperties: false
> +        description: A port node pointing to DPI host port node
> +
> +        properties:
> +          endpoint:
> +            $ref: /schemas/graph.yaml#/$defs/endpoint-base
> +            unevaluatedProperties: false
> +
> +            properties:
> +              link-frequencies:
> +                minItems: 1
> +                maxItems: 1
> +                description: Allowed max link frequencies in Hz
> +
> +      port@1:
> +        $ref: /schemas/graph.yaml#/$defs/port-base
> +        unevaluatedProperties: false
> +        description: Video port for DP output
> +
> +        properties:
> +          endpoint:
> +            $ref: /schemas/graph.yaml#/$defs/endpoint-base
> +            unevaluatedProperties: false
> +
> +            properties:
> +              data-lanes:
> +                oneOf:
> +                  - minItems: 1
> +                    maxItems: 1
> +                    uniqueItems: true
> +                    items:
> +                      enum:
> +                        - 0
> +                        - 1
> +                    description: For one lane operation.
> +
> +                  - minItems: 2
> +                    maxItems: 2
> +                    uniqueItems: true
> +                    items:
> +                      enum:
> +                        - 0
> +                        - 1
> +                    description: For two lanes operation.
> +
> +                  - minItems: 4
> +                    maxItems: 4
> +                    uniqueItems: true
> +                    items:
> +                      enum:
> +                        - 0
> +                        - 1
> +                        - 2
> +                        - 3
> +                    description: For four lanes operation.

I would do just:

data-lanes:
  minItems: 1
  items:
    - enum: [ 0, 1 ]
    - const: 1
    - const: 2
    - const: 3

It does allow 3 lanes, but I don't think that's a big deal. What it does 
doesn't allow is any order and yours does.

Rob